.contentBox{
    border: 1px solid #E3E3E3;
    width: 80px;
    border-radius: 30px;
}
.btnBox{
    width: 80px;
    height: 30px;
    border-radius: 30px;
    -webkit-border-radius:30px;
    -moz-border-radius:30px;
    background-color: gray;
    position: relative;
    cursor: pointer;
    color: #fff !important;
}
#btn{
    width: 30px;
    height: 28px;
    left: -1px;
    border:1px solid #E3E3E3;
    border-radius: 30px;
    -webkit-border-radius:30px;
    -moz-border-radius:30px;
    background-color: #fff;
    position: absolute;
}
.off{
    display: inline-block;
    padding: 3px;
    text-align: left;
    padding-left: 35px;
}
.on{
    display: none;
    padding:3px;
    text-align: left;
    padding-left: 5px;
}